The relay of the AUR381Z series is designed to monitor 3(N)AC systems for asymmetry, undervoltage and phase failure.External supply voltage is not required. The internal supply voltage is electrically isolated from the system. Special input transformers attenuate of interferences from the system. An integrated protective circuit is provided for use in systems with interferences.

• Monitoring of 3(N)AC systems for asymmetry, undervoltage and phase failure
• Without external supply voltage
• Adjustable response value 5…15 % / 0.7…0.95 x Un

• Monitoring of the power supply of motors or electrical installations
• Monitoring of asymmetrically loaded systems